Vibrational analysis of power tools using a novel three dimensional scanning vibrometer

Scanning Laser Doppler Vibrometers (SLDV) are widely used in product development. Power tools as for example percussion drilling machines are known to be noisy and vibrating. It is state of the art to reduce the noise and vibration by finding the sources therefrom with LDV. Although these data give important information about the vibrational behaviour, for a deeper understanding three dimensional vibration data is required. Therefore, for the first time measurements on power tools have been performed using a novel 3D SLDV, which simultaneously measures three components of the vibration vectors using three vibrometers. Power tools are observed under operating conditions close to reality, operated by a human. As the device under test performs movements in all directions, the three laser beams do not perfectly intersect. It is shown, that the introduced error can be neglected for low frequencies. Results are presented for a percussion drilling machine and a random orbit sander.